LLR:
(73*10^72735+53)/9 is base 3-Strong Fermat PRP! (72736 decimal digits) Time : 105.094 sec.
(73*10^72735+53)/9 is strong-Fermat, Lucas and Frobenius PRP! (P = 4, Q = 2, D = 8) Time : 422.197 sec.

To be completed...